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A kind of method that utilizes lignin to replace formaldehyde to prepare lignin-based phenolic resin

A technology of lignin-based and phenolic resins, which is applied in the field of preparation of lignin-based phenolic resins, can solve the problems of high prices and increased production costs of phenolic resins, and achieve the effects of sufficient and thorough reactions, reduced formaldehyde release, and reduced demand for formaldehyde

Active Publication Date: 2022-06-28
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these studies have replaced formaldehyde in phenolic resins with other aldehydes to a certain extent, in essence, glyoxal and paraformaldehyde are still derived from fossil resources, and their prices are higher than formaldehyde, which will increase the quality of phenolic resins. Resin production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: The embodiment of the present invention discloses a method for preparing a lignin-based phenolic resin by using lignin as a raw material to replace formaldehyde and phenol, including the following steps:

[0027] Step a: respectively get 94g phenol, 7.3g alkali lignin, 138.5g mass percent formaldehyde that is 37% and 83.7g 8M NaOH solution; Lignin or nano-lignin and formaldehyde are mixed and stirred to make a mixture (this implementation In the example, the ratio of lignin to replace formaldehyde is 5%);

[0028] Step b: adding a mixture of two-thirds of the total mass to the phenol, and adding an alkaline substance of two-thirds of the total mass as a catalyst, heating the temperature to 65° C., and stirring for 30 minutes;

[0029] Step c: Add the remaining mixture and alkaline substance again, then slowly raise the temperature to 95°C and keep it constant for 4h;

[0030] Step d: cooling to room temperature to prepare a lignin-based phenolic resin, an...

Embodiment 2

[0031] Embodiment 2: The embodiment of the present invention discloses a lignin-based phenolic resin prepared by using lignin as a raw material to replace formaldehyde and phenol. The preparation method of the lignin-based phenolic resin includes the following steps:

[0032] Step a: respectively get 94g phenol, 7.3g alkali lignin, 138.5g mass percent formaldehyde that is 37% and 83.7g 8M NaOH solution; Lignin or nano-lignin and formaldehyde are mixed and stirred to make a mixture (this implementation In the example, the ratio of lignin to replace formaldehyde is 5%);

[0033] Step b: adding a mixture of two-thirds of the total mass to the phenol, and adding an alkaline substance of two-thirds of the total mass as a catalyst, heating the temperature to 65° C., and stirring for 30 minutes;

[0034] Step c: Add the remaining mixture and alkaline substance again, then slowly raise the temperature to 95°C and keep it constant for 4h;

[0035] Step d: cooling to room temperature t...

Embodiment 3

[0037] Embodiment 3: The embodiment of the present invention discloses a method for preparing a lignin-based phenolic resin by using lignin as a raw material instead of formaldehyde and phenol to react, comprising the following steps:

[0038] Step a: respectively get 47g phenol, 21.87g alkali lignin, 51.03g mass percent formaldehyde and 41.63g 8M NaOH solution of 37%; mix and stir lignin or nano-lignin and formaldehyde to make a mixture (this implementation In the example, the ratio of lignin to replace formaldehyde is 30%);

[0039] Step b: adding a mixture of two-thirds of the total mass to the phenol, and adding an alkaline substance of two-thirds of the total mass as a catalyst, heating the temperature to 65° C., and stirring for 30 minutes;

[0040] Step c: Add the remaining mixture and alkaline substance again, then slowly raise the temperature to 95°C and keep it constant for 4h;

[0041] Step d: cooling to room temperature to prepare a lignin-based phenolic resin, an...

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Abstract

The invention discloses a method for preparing lignin-based phenolic resin by using lignin instead of formaldehyde, comprising the following steps: step a: weighing phenol, lignin or nano lignin, formaldehyde and alkaline substances; Add two-thirds of the other raw materials in step a to the phenol container, heat up to 60-65°C, keep warm and stir for 10-30min; step c: add the remaining other raw materials in step a again, slowly heat up to 70-95°C and Keep it constant for 1‑5h; Step d: Cool to room temperature to prepare a lignin-based phenolic resin, and store the prepared resin below 25°C. Beneficial effects of the present invention: the method for preparing lignin phenolic resin by directly replacing part of formaldehyde with lignin or nano-lignin reduces the need for formaldehyde in the production process, reduces the formaldehyde emission of wooden furniture in daily life, and simultaneously produces Process green safety is more conducive to large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of phenolic resin preparation, in particular to a method for preparing lignin-based phenolic resin by using lignin to replace formaldehyde. Background technique [0002] In recent decades, my country's wood processing industry has developed rapidly, and the use of wood adhesives has increased significantly, which has led to the rapid development of my country's wood adhesive industry. Adhesives are known to play an important role in the timber construction industry. Phenolic resin is a general term for a large class of resins prepared by polycondensation with phenolic and aldehyde compounds as raw materials. Phenolic (PF) resin has strong moisture resistance, low initial viscosity and excellent temperature stability. etc. (Zhang R, JinX, Wen X, et al. Alumina nanoparticle modified phenol-formaldehyde resin as awood adhesive [J]. International Journal of Adhesion & Adhesives, 2018, 81: 79-82; Kalami S, Arefm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/28
CPCC08G8/28
Inventor 周娜陈宇龚晓武杨高山贾鑫
Owner SHIHEZI UNIVERSITY
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